There is a one.35mm DC port for an external power provide but its linked on to the 5V line Therefore if you might want to externally power, we advise prying open up the situation and chopping the pink 5V line in the USB https://sachindaif577049.oblogation.com/28192471/the-2-minute-rule-for-iogear-2-port-usb-2-0-automatic-printer-switch